Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I'm not entirely sure what you're asking or confused about...
The Min Cost point of your optimization shows a reduction in annualized energy costs of 200 USD/year, as you indicated. If you look at the utility bills alone (right-click on bottom-left graph and choose Graph Type > Utility Bills), you can see that there are savings of 1321 USD/yr. So approximately 1121 USD/yr is being spent towards efficiency improvements, which over the course of a 30 year analysis period, is indeed tens of thousands of dollars.
(I had to use "USD" instead of "$" because Unmet Hours kept messing up the formatting.)
